Análise dos cromossomos sexuais de Characidium (Characiformes, Crenuchidae) por microdissecção e pintura cromossômica

Pós-graduação em Ciências Biológicas (Zoologia) - IBB

Perinatal Androgenic Exposure and Reproductive Health Effects Female Rat Offspring

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Absence of effects on the rat sperm quality after subacute exposure to low doses of fungicide prochloraz

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Differentiation of the XY Sex Chromosomes in the Fish Hoplias malabaricus (Characiformes, Erythrinidae): Unusual Accumulation of Repetitive Sequences on the X Chromosome

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Temporal and morphological differences in post-embryonic differentiation of the mushroom bodies in the brain of workers, queens, and drones of Apis mellifera (Hymenoptera, Apidae)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Role of early GnRH administration in sexual behavior disorders of rat pups perinatally exposed to lead

The effects of maternal exposure to lead (Pb) during the perinatal ( 1% and 0.1% Pb) periods of sexual brain differentiation were studied in adult male offspring. Maternal Pb levels were measured after treatment. Behavioral (open field and sexual behavior), physical (sexual maturation, body and organ weights), and biochemical (testosterone levels and hypothalamic monoamine and respective metabolite levels) data were assessed in perinatally exposed offspring. The effects of gonadrotopin-releasing hormone (GnRH) administration to pups at birth on puberty and sexual behavior were also investigated in offspring postnatally exposed to the metal. Results showed that perinatal administration of the two Pb concentrations did not modify maternal weight gain; 1% Pb exposure reduced offspring body weight during the 7 days of treatment while no changes were observed after 0.1% Pb exposure; neither ph concentration altered offspring sexual maturation; the higher Pb concentration improved sexual behavior while the 0.1% concentration reduced it; exposure to 0.1% Pb caused decrease in testis weight, an increase in seminal vesicle weight and no changes in plasma testosterone levels; hypothalamic VMA levels were increased compared to the control group; GnRH administration reversed the effects of 0.1% Ph administration on male sexual behavior. These results show that perinatal exposure to ph had a dose-dependent effect on the sexual behavior of rats and that a decrease in GnRH source in the offspring was probably involved in the reduction of their sexual performance. (C) 2001 Elsevier B.V. All rights reserved.

Morphometry and sexual maturity of the tropical hermit crab Calcinus tibicen (Crustacea, Anomura) from Brazil

Ontogenetic changes in relative growth were studied in the hermit crab Calcinus tibicen in order to determine its growth phases with sexual maturity. Specimens were collected at 2-month intervals for two consecutive years. A total of 570 individuals was collected and analysed. Total mean animal size in terms of shield length was 5.14±1.23mm for males, 4.23±0.79mm for females and 4.53±0.60mm for ovigerous females. Sexual dimorphism in chela dimensions was stronger in males than in females. Differences between males and females were found in left propodus length (LPL) and height (LPH) versus shield length (SL) and wet weight (WW) versus SL relationships. Males showed a high positive allometry, while juveniles and adult females were isometric for the LPL/SL relationship. Negative allometry was observed in adult females in the LPL/SL relationship. The size at which a differentiation occurred in the growth of the chelipeds and in the weight gain of males and females was between 3.0 and 3.2mm SL, suggesting that sexual maturity occurs in small-sized individuals in the life cycle of C. tibicen.

Citogenética de 13 espécies de aranhas haploginas pertencentes às famílias Pholcidae, Sicariidae e Scytodidae (Araneomorphae): evolução cromossômica, sistema cromossômico de determinação sexual e citotaxonomia

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Analisando a determinação sexual de vertebrados com base em redes de interação entre proteínas

Pós-graduação em Ciências Biológicas (Genética) - IBB

Contribuições a elucidação da estrutura, origem e evolução de neo-sistemas cromossômicos de determinação sexual em gafanhotos utilizando como modelo espécies dos gêneros Chlorus, Dichromatos e Eurotettix (Melanoplinae; Acrididae)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estudo comparativo do genoma e do transcriptoma de Phyllosticta citricarpa (fase sexual Guignardia citricarpa) agente da Mancha Preta dos Citros e Phyllosticta capitalensis

Pós-graduação em Ciências Biológicas (Genética) - IBB

Relative growth and morphological sexual maturity of the mangrove crab Aratus pisonii (H. Milne Edwards, 1837) (Decapoda, Brachyura, Sesarmidae) on the southern coast of the state of Sao Paulo, Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Identification of the molecular sex-differentiation period in the siberian sturgeon

Sexual development prior to gonadal sex differentiation is regulated by various molecular mechanisms. In fish, a molecular sex-differentiation period has been identified in species for which sex can be ascertained prior to gonadal sex differentiation. The present study was designed to identify such a period in a species for which no genetic sex markers or monosex populations are available. Siberian sturgeons undergo a slow sex-differentiation process over several months, so gonad morphology and gene expression was tracked in fish from ages 3-27 months to identify the sex-differentiation period. The genes amh, sox9, and dmrt1 were selected as male gonad markers; cyp19a1a and foxl2a as female gonad markers; and cyp17a1 and ar as markers of steroid synthesis and steroid receptivity. Sex differentiation occurred at 8 months, and was preceded by a molecular sex-differentiation period at 3-4 months, at which time all of the genes except ar showed clear expression peaks. amh and sox9 expression seemed to be involved in male sexual development whereas dmrt1, a gene involved in testis development in metazoans, unexpectedly showed a pattern similar to those of the genes known to be involved in female gonadal sex differentiation (cyp19a1 and foxl2a). In conclusion, the timing of and gene candidates involved with molecular sex differentiation in the Siberian sturgeon were identified. Mol. Reprod. Dev. 2015. © 2015 Wiley Periodicals, Inc.

Compreendendo a dinâmica familiar de adolescentes expostos a violência sexual intrafamiliar

Violence in adolescence, specifically sexual violence, is a topic of great relevance. Not only in Brazil but the world has witnessed the increase of sexual violence, becoming the most prevalent morbid occurrence in adolescence. Draws attention to the phenomenon of sexual violence against children and adolescents not only the fact that most of the victims are assaulted in their own home environment, but also the type of relationship between victim and aggressor. Thus, based on systemic approach, this study aimed to compose eend family dynamics of adolescent victims of sexual intra-familial. Participants were seven teenagers and their parents, users and beneficiaries of services offered by CREAS - Reference Center for Specialized Social Assistance in a municipality of Mato Grosso do Sul. The instruments used were the Test of Drawing in Colour of the Family (FCDT) and a questionnaire about the pictures taken and family interactions. The results indicated the difficulty in differentiating family roles, especially regarding the differentiation of the mother and daughter, a fact that seemed to be the motivator for the impoverishment of individuation in groups. Also noted the presence of conflict between the familiar figures probably originated from this abusive situation. In this context, the studied families showed communication difficulties between family members, hindering the integration between them, as well as the existence of an authoritarian leadership and strict rules performed by the father figure. These results may support preventive and therapeutic actions to situations of sexual violence against children and adolescents. Thus, it is suggested that psychological counseling for the study participants and other stakeholders with a view to reducing damage and recovery of quality of life for all family members, as well as the need for further studies in the area in question.